Paper making



C. A. THEFT PAPER MAKING Filed Aug. l, 1924 i Patented Apr. 9, 1929.

' P'ATENT OFFICE.

cnaauis a Tram. or HOLYQKE, mssacnusnr'rs.

- rum Maxine. 1

: 'Application filed August 1, 1924. Serial-No. 729,042. 'j

Heretofore it has-been customary in certain paper mills to use what 1s known as a Jordan between the machine chest and the paper-making machine so that the Jordan is continuously treating just the amount-of stock that the paper-making machine is using. Furthermore it has-been necessary -to-control the amount of stock passing to the machine and this has invariably been done by means of a gate controlling the amount of' stock passing into the Jordan; that is,

the stock was controlled prior to its passing into the Jordan and. not 'subsequentthereto.

This method o'f operation permitted the .stock, as-soon as it passed'through the gate,

Y to flow on through the Jordan to the papermaking machine there being little tendency for itto accumulate-in the Jordan. To have j the Jordan properly treat this material it has been necessary to use ajconsiderable amount of water and to set the knives of the Jordan rather closely. This causes a rapid wearingofthe knives and also there is considerablecutting of the of which are undesirable.

It has long been recognized that it was desirable .to have the Jordan full of. stock or as full as possible, and one common pulp fibre both *method of attempting to accomplishithis was as follows. An adjustable .dam was in- 'stalled where the stock was flowing away from the Jordan.

with an overtlow which could be made' features mentioned above.

This consisted of a boX higher or lower by using more boards or fewer boards. This would holdback the material in the Jordan to a certain extent and tend-to lessen some of the undesirable 7 However this #method-did not fully accomplish the desired resultseven though it helped-some. An-

other feature of the dam method and per-.

- 'hapsflthe most undesirable one was that the stock seemed to' beheld back and then it would be suddenly released flooding the paper-making machine with an excess of stock. This gave a paper greatly lacking-in uniformity. It is-not necessary for the pur poses of this specification to set forth the when suflicient material has accumulated behind it to force it oven];

ating on an old and l machine.

or more on the stock in the Jordan. It also places the'means 'for'controlling the flow of stock on the outlet side of the Jordan where this pressure exists. The dam method operk v entirely different princ1ple used a head of not more than two or three feet and would not be at all adapted tosuch a head as my=method gives. Also less water -1s necessary to give the proper treatment in the ordan. Itis not necessary to ad ust the knives as closely. Also the result of a readjustment of the setting of the gate 1s not so slow to become effective on the paper-making machine as in the former practice where a considerable amountof materlal accumulated between the'gate and the As already stated, this method of having the- Jordan just the knives sov closely. The resultant actlon 1n the Jordan seems to have less cutting but more of a drawing out of the fibre similar to the action in the beaters. This is called hydrating and roduces a su erior guallty of stock. p p

. One advantage is that ormerly the knives wore very rapidly and have vfound this method to increase the" Mullen tester reading by ten or fifteen percent on heavy paper such as let-pound. cover paper and; even. fifty percent on light weight bond, or tissue paper. Furthermore this is done with a reduction ofthe time the stockspends in the beater by as high as forty percent. Thus the beater capacity for a given run of paper is reduced at the same time as the quality is being improved. Also the spasmodic action of-the dam method is entirely absent in mymethod. There are also other advantages but the above appear at present to be the most important ones.

My invention is capable of a variety of expressions and I do not wish'toconfine myself to the specific form herein described.

' So far as my experiments with an entirely full makes it unnecessary to adtaken to the paper-making machine.

new method have indicated, the preferred lills up the Jordan box 4. until it is higher than the overflow barrier and the excess flows to the. leftand back to the machine chest through pipe 6. The stock for the paper-making machine passes through the pipe '7 into the Jordan 8 and then through the pipe 9 to the gate which is shown at 10. The gate 10 is adjustable so that the amount of stock that. passes through and to the paper-making machin e-12 or its save-all box- 11 may be changed from time to time as the weight of the paper may require. I prefer to carry thepipe 9 in a more or less uniform pitch from the Jordan 8 to the gate 10.

Just how farthis condition could be varied without materially affecting the result I do 'not know but if sharp turns were introduced so as to produce pockets some of the disadvantages of the dam method of control would ensue.

The operation is as follows. The course the stock follows has already been indicated.

' The gate 10 is set to permit the'proper making machine.

amount ofstock to pass on toward the paper- Inasmuch as the stuff pump 3 is supplying more stock than the paper-making machine requires, the stock will fill up the pipe 9, Jordan 8, pipe 7 and finally the Jordan box 4 untilthe overflow pipe (3 is taking all the excess back to the machine chest 1 B'ythis means the Jordan is always operating full of stock and under ahead or pressure. It is possible to set the knivesof the Jordan 'less closely and to use less water. I have found that this gives more of a beater action and less of a cutting action to the paper stock. The numerous advantages derived thereby have already been set forth and will not be repeated.

To elucidate'more fully the former practice and wherein it diifered from my method the position of the gate according to the 4 former practice has been indicated at '13. By

- adjusting this gate at 13 the proper amount of material would pass on toward the papermaking machineand therefore thejsame excess would return to the macl'iine chest 1 by way. of the pipe 6. By this arrangement, however, the Jordan would notfbe more than half full of material. It would' be necessary -to set, the knives closer with consequently greater wear'and less desirable results generally as already set forth. Also the amount of stock passing to the paper-making machine could not be changed so promptly because the gate 13 was considerably farther from the paper-making machine than is the gate 10.

But even more valuable than the results in the Jordan itself is the greater uniformity of the stock flowing to the paper-making machine and consequent greater uniformity in the paper. The precise reason for thisis not at present understood. One theory al-.

ready-mentioned is that the use of a dam permits pocketing of the material and then its sudden release. follows. IVhen the gate is on the inlet side of the Jordan it makes no difference whether the'stoek is thick or thin in the amount of stockthat passes through the Jordan for the latterwill treat and pass on whatever comes to it.- But with the gate on the outlet side and the pressure backed up; through the Jordan the amount of stock that passes through will depend somewhat on the density. In other words if it is thick the Jordan will only be able to treat a somewhat smaller quantity and the thicker stock which would otherwise make a'heavier sheet of paper is somewhat compensated'for by the fact that a less quantity passes onto the machine per unit time. But whatever may be the true theory of operation there is no doubt but that the paper is far more uniform than with the gate at the inlet side of the Jordan.

Another very important advantage is the elimination of stuff-gate plugging. In the old method with thegate at 13 and very little head behind it, if only required a small amount of unclear-ed stock to stop the flow entirely to the Jordan which in turnwould result in the paper web leaving the" wire.

With the gate at 10 this trouble has been entirely eliminated. Any such unclcared stock is completely hydrated before it reaches the gate.

I claim:

1. In paper-mill machinery, the conibination of a Jordan, a paper-making machine, a pipe discharging directly from the Jordan to the paper-making machine, said ipe be ing carried in a uniform pitch, anc a gate controlling the flow in said pipe.

2. In paper-mill machinery, the combination of a paper-making machine, a Jordan, connections through which the paper stock flows directly from said Jordan to said 1nachine, and means in said connections where by a head is maintained on the stock in the Jordan in excess of the. elevation of any portion of said connections.

Another theory is, as

3. In paper mill machinery, the combination of a paper-making machine, a Jordan, connections through WhlCll the paper stock iii mossesflows directly from said Jordan to said machine, and a gate in said connections for simultaneously regulating the quantity of stock delivered to said machine and maintaining a head on the stock in the Jordan.

4. In paper-mill machinery, the combination of a paper-making machine, a Jordan, a closed passage through which the paper stock flows from said Jordan directly to said machine, and means in said passage for constricting the same to regulate the flow of stock and maintain a pressure on the stock.

5. In the manufacture of paper, the method which consists in passing the paper stock through a Jordan, maintaining the stock in said Jordan under a relatively high head, passing the stock directly to a papermaking machine, and regulating the quantity of stock flowing from the Jordan to the paper-making machine to maintain relatively high pressure on the stock in the Jordan.

(5. In the manufacture of paper, the method which consists in passing the paper stock through a Jordan, passing the stock from the Jordan directly to a paper-making machine through a closed passage, and constricting the passage from said Jordan to said machineto regulate the-quantity of stock delivered to said machine.

7. In the manufacture of paper'wherein a Jordan delivers directly to' the paper-making machine, the step of controlling the flow of stock to the paper-making machine at the outlet side of the Jordan.

8. In the manufacture of paper wherein a Jordan delivers directly to the paper-male ing machine, the step of controlling the flow of stock between the Jordan and the papermaking machine Where the stock is under a pressure by reason of said control.

9. In combination, a Jordan, a paper-making machine, a Jordan box located at a higher level than the Jordan, means for feeding stock to the Jordan box at a faster rate than required by the paper-making machine, an overflow in said Jordan box, a closed conduit from said Jordan box to said Jordan, a second closed conduit from said Jordan to said paper-making machine, and means in said second conduit for controll ing the rate at which stock is fed to the paper-making machine.

10. In paper-mill machinery, the combination of a J ordan,'a paper-making machine, a pipe passing continuously downward from a feed point above said Jordan to said Jor clan and continuously downward from said Jordan'to said paper-making machine, and means in said pipe at said paper-making machine forsimultaneously controlling the flow of stock and maintaining a head on the stock in said Jordan.

In testimony whereof I afiix my signature."

CHARLES A. 'IIFFT. 

